U.S. patent number 4,350,592 [Application Number 06/136,085] was granted by the patent office on 1982-09-21 for cartridge filter.
Invention is credited to Dirk G. Kronsbein.
United States Patent |
4,350,592 |
Kronsbein |
September 21, 1982 |
Cartridge filter
Abstract
A cartridge filter for gases and liquids having a filter element
clamped between an upper and lower cover. The filter includes a
profile ring composed of a sealing compound which is firmly
connected to the upper end face and an identical and corresponding
profile ring firmly connected to the lower end face of the filter
element. Sealing rings are embedded in the profile rings. The
covers each includes one circumferential groove engaging around the
sealing rings in a claw-like manner.
Inventors: |
Kronsbein; Dirk G. (4000
Duesseldorf, DE) |
Family
ID: |
6068659 |
Appl.
No.: |
06/136,085 |
Filed: |
April 10, 1980 |
Foreign Application Priority Data
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Apr 19, 1979 [DE] |
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2915730 |
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Current U.S.
Class: |
210/450; 55/510;
55/486; 55/505; 210/491; 55/502 |
Current CPC
Class: |
B01D
24/08 (20130101); B01D 29/15 (20130101); B01D
29/23 (20130101); B01D 35/30 (20130101); B01D
46/0004 (20130101); B01D 29/58 (20130101); B01D
46/2411 (20130101); B01D 46/0043 (20130101); B01D
2265/02 (20130101); B01D 2265/06 (20130101); B01D
2271/022 (20130101); B01D 2275/10 (20130101) |
Current International
Class: |
B01D
46/24 (20060101); B01D 35/30 (20060101); B01D
29/13 (20060101); B01D 24/08 (20060101); B01D
29/23 (20060101); B01D 29/15 (20060101); B01D
24/02 (20060101); B01D 027/08 (); B01D
046/02 () |
Field of
Search: |
;55/486,487,500,502,505,510,485
;210/445,450,451,454,455,459,477,491,489 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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2255933 |
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Jul 1975 |
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FR |
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709897 |
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Jun 1954 |
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GB |
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756336 |
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Sep 1956 |
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GB |
|
794372 |
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Apr 1958 |
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GB |
|
816520 |
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Jul 1959 |
|
GB |
|
880537 |
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Oct 1961 |
|
GB |
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907747 |
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Oct 1962 |
|
GB |
|
909894 |
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Nov 1962 |
|
GB |
|
988692 |
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Apr 1965 |
|
GB |
|
1018379 |
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Jan 1966 |
|
GB |
|
1382320 |
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Jan 1975 |
|
GB |
|
1437004 |
|
May 1976 |
|
GB |
|
1518097 |
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Jul 1978 |
|
GB |
|
Primary Examiner: Lacey; David L.
Attorney, Agent or Firm: Toren, McGeady & Stanger
Claims
I claim:
1. In a cartridge filter for gases and liquids having a filter
element clamped between an upper and lower cover, the improvement
comprising that said filter includes a profile ring composed of a
epoxy resin sealing compound cast onto the upper end edge of the
filter element and an identical and corresponding profile ring cast
onto the lower end edge of the filter element and sealing rings
embedded in said profile rings, said profile rings each including
one circumferential groove engaging around said sealing rings in a
claw-like manner.
2. A filter according to claim 1 wherein the filter element
consists of two coaxial support wall cylinders with through
openings, between which cylinders a filter medium of a plurality of
layers is situated.
3. A filter according to claim 2, wherein the filter medium is of
three-layer composition having a middle layer, which is a main
filter layer and two prefilter layers positioned on opposite sides
of said middle layer.
4. A filter according to claim 2, wherein a filter jacket of filter
material is situated on the outer support wall cylinder.
5. A filter according to claim 2, further including a tension rod
screwed into the upper cover, and which passes through the lower
cover and said rod comprises a threaded portion at its lower end
which is secured to a nut.
6. A filter according to claim 1, wherein said upper cover contains
through openings.
Description
FIELD OF THE INVENTION
This invention relates to a cartridge filter for gases and liquids,
comprising a filter element clamped between an upper and a lower
cover.
BACKGROUND OF THE INVENTION
A filter is described in the German Auslegeschrift DE-AS No. 25 06
359, having a bomb-shaped (i.e., closed and rounded at one end)
filter housing, which is attached by means of a collar piece to an
inlet and outlet head comprising an inlet duct and an outlet duct.
A filter element is screwed into the head component by means of a
threaded component. The threaded component possesses windows, which
form a communication between the inlet duct and the internal space
of the threaded component and filter cartridge. A further end cap
is connected to the threaded component by means of a tension rod.
The inlet and outlet head is sealed from the threaded component by
an annular seal and also from the filter housing by an annular
seal.
In filters of this type, the filter medium becomes dirty and must
either be cleaned or replaced by a new filter medium. For filter
media that can be cleaned, cleaning cannot be repeated an unlimited
number of times, so that such filter media also must be replaced
after a certain time. Depending upon the particular form of
construction, the entire filter must be changed.
A filter is described in German Offenlegungshcrift DE-OS No. 27 06
017; wherein a hollow cylindrical filter element extends between an
upper and a lower cover. The upper cover is furnished with a
central opening, which is shaped to form an external thread
extending coaxially to the hollow cylinder. A sealing ring situated
between the upper cover and the external thread ensures that the
region in which the medium to be filtered is situated is sealingly
separated from the region in which the purified medium is
situated.
In this filter, the upper and lower covers are firmly connected to
the filter element, so that what was stated above in regard to the
filter described in DE-AS No. 25 06 359 applies here also, to the
effect that after a specific degree of fouling has been reached,
the filter in total must be removed and replaced by a new filter.
This is laborious and increases the costs to the operator.
The task underlying the present invention is to create a filter, in
which the separate filter components can be separated without
difficulty from one another and the fouled filter element can be
replaced by a new one in a simple manner. This task is achieved
according to the present invention in that a sealing ring is
situated each on the upper and the lower end face of the filter
element.
According to a further feature of the invention, the sealing rings
are firmly connected to the filter element. It is to be recommended
here that the sealing rings shall be embedded in a grouting
compound, for example epoxy resin. The sealing rings should lie in
grooves, the side walls of which grip around the rings in the
manner of claws. The sealing rings therefore do not develop any
springing action during pulling out. With attendant advantage, the
epoxy resin forms a profile ring in the region of the sealing rings
in such a manner that the two end regions of the filter tube fit
with only slight tolerance into the grooves of the upper and lower
cover. The cover may be formed as an adapter for a filter housing
or may be a component of the filter housing. In the filter of this
invention, the metal end caps are omitted in favour of the epoxy
ring.
In this manner, a filter element is obtained, which can be removed
without difficulty after a specific degree of fouling has been
reached and replaced by a new one. It is therefore a throw-away
component. If the sealing rings are firmly connected to the filter
tube, then there is no risk of a sealing ring being forgotten in
the assembly or insertion of a new filter tube.
In the filter of this invention, the covers and the tension rod are
retained, which leads to lower operating costs.
SUMMARY OF THE INVENTION
The filter element can consist of two coaxial supporting cylinders
with passage openings, between which a filter medium consisting of
a number of layers of different porosity is situated. The outer
layers preferably serve as a prefilter layer and a layer situated
between them as a main filter layer.
The filter medium is preferably of three-layer composition and the
central layer consists of microfibre tissue free of binding agent,
which is covered on each face with a layer of support fibre tissue
free of binding agent. The microfibre tissue may consist of glass
fibres, whereas the support fibre tissue may be of nylon fibres as
a prefilter. In addition, a filter jacket of filter material, for
example foam material, may be situated on the outer support
cylinder.
Preferably, the tension rod is screwed in from below into the upper
cover or into the filter casing head formed as a cover, passes
through the lower cover and carries at its lower end a nut. The
upper cover can have passage openings.
The invention is explained in more detail below with reference to
an example of embodiment thereof illustrated in the drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a perspective view of a filter element of this
invention, partly cut away;
FIG. 2 shows a diagrammatic longitudinal section through the filter
element of FIG. 1, but without an external filter jacket;
FIG. 3 illustrates a plan view on the filter element along the line
III--III of FIG. 2 and
FIG. 4 shows an enlarged section through a portion of the filter
element with the sealing ring according to the present
invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Between an upper cover 1, which may be an adapter or permanent
component of a filter housing, and a lower cover 2, a filter
element 3 is situated. The upper cover 1 has a deep-drawn base 4
and a rim 5 surrounding this. The rim 5 is internally smooth and
carries, if it is formed as an adapter, a thread 6 on the outside
by which the filter element is screwed onto a casing or pipe.
Through openings 7 distributed around a circle are situated in the
cover base 4. In the vicinity of its periphery, the upper cover 1
possesses, on its side towards the filter element 3, an annular
groove 9 into which the filter tube 3' engages. The filter element
3 has a synthetic resin mass cast onto its upper edge in such a
manner that a peripheral synthetic resin ring 10 results, which
surrounds the upper edge of the filter tube 3' and in the end face
of which a sealing ring 12 is situated in a groove 11. The groove
11 engages around the sealing ring preferably in a claw-like manner
(FIG. 4).
The filter tube 3' is connected to the lower cover 2 in the same
manner as to the upper cover 1, i.e. the filter element likewise
engages with a synthetic resin ring 10 into an annular groove
9.
In the upper cover 1, there is an open-bottomed blind bore 13 with
internal thread, into which a tension rod 14 is screwed with its
external thread 15. For securely connecting the upper cover 1 to
the filter element 3 and to the lower cover 2, the tension rod 14
passes through an opening 16 in the lower cover 2 and comprises a
threaded end 15 which is threaded onto a clamping nut 17 having a
roughened surface. A bore 18 for tightening up the tension rod 14,
by means of a pin, is provided in the clamping nut 17.
The filter tube 3 consists of two coaxial support walls 19, 20 of
stainless steel with outlet openings 21. The central layer 22 of
the filter medium consists of three layers, not shown individually,
that is, two prefilter layers and a main filter layer situated
therebetween. On the outer support wall 19 there is seated a filter
jacket 23 of filter material or foam material.
During filtering, the medium to be filtered flows in the direction
of arrow 24 and branches out in the direction of arrows 25, 26 in
order to pass through the inlet bores 7 into the interior of the
filter element 3. From here, the medium leaves the space inside the
filter element 3 in the direction of arrows 27, 28.
While the foregoing description and drawings represent the
preferred embodiments of the present invention, it will be obvious
to those skilled in the art that various changes and modifications
may be made therein without departing from the true spirit and
scope of the present invention.
* * * * *